[Datetime-SIG] A local timezone class

[Guido van Rossum]

On Mon, Aug 31, 2015 at 2:56 AM, Akira Li <4kir4.1i at gmail.com> wrote:

> Guido van Rossum <guido at python.org> writes:
>
> > I've written a simple class that implements a local timezone tzinfo
> object,
> > deferring to what the time module exposes about the local zone.
> >
> > https://gist.github.com/gvanrossum/ef201fe313719305c4c7
> >
> > There are two variations: one for systems that support tm_gmtoff and
> > tm_zone, one for systems without those.
> >
> > Output of the test program:
> >
> > BetterLocalTimeZone
> > Fri Aug 28 15:50:22 2015 PDT (-0700)
> > Wed Feb 24 15:50:22 2016 PST (-0800)
> >
> > I'm not entirely sure why we didn't add this to the stdlib ages ago.
> (Maybe
> > out of a sense of perfectionism, since time.localtime() may be wrong for
> > dates in the past or future where different DST rules or a different
> > standard offset apply? But why would we care, if we're fine with the time
> > module's behavior?)
>
> If tm_gmtoff, tm_zone attributes are not available then time module does
> not provide a way to get correct tzname [1]. In particular,
> datetime.astimezone() may fail to return a correct tzname due to that [2]
>
> [1] http://bugs.python.org/issue22798


That bug report is incomprehensible. You have received feedback about this
already.


>
> [2]
> https://mail.python.org/pipermail/datetime-sig/2015-August/000471.html
>

So is this message.

-- 
--Guido van Rossum (python.org/~guido)
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